1 Therma Cable Floor Heating System 4
1.1 General Information 4
1.2 Always 6
1.3 Never 6
2 Technical Information 7
2.1 Surface Area and Power Output of Therma Cable Products 7
2.2 Insulation Test 8
2.3 Resistance Test 9
3 Types of Heating and Floor Covering 10
3.1 Floor Warming 10
3.2 Radiant Floor Heating 10
3.3 Typical Floor Coverings 11
4 Installation Instructions 12
4.1 Planning Work 12
4.2 Preparing the Subfloor 13
4.3 Marking the Floor 13
4.4 Installing the Therma Cable Floor Heating System 14
4.5 Installing the Temperature Sensor 17
4.6 Applying Self-Levelling Cement 18
4.7 Connecting the System 19
4.8 Measuring Resistance and Measures' Table 20
4.9 Using the Therma Cable System 20
5 Temperature Regulation 21
6 FAQ 22
6.1 Floor Heating System 22
6.2 Installation 22
7 Expert Tips: Installation and Floor Covering 24
7.1 Installation Tips 24
7.2 Floor Covering Tips 24
8 Warranty 25
8.1 Warranty Statement 25
3
Table of Contents
1.1 General Information
The installation must meet the following building codes, as applicable:
- Canadian Electrical Code (CSA C22.1)
- American National Electricity Code (ANSI/NFPA 70)
- Any other national or local code
The Therma Cable floor heating system is composed of a heating cable along with
a lead for connection to an electrical power source. Therma Cable meets the fol-
lowing in The Canadian Electrical Code standard: series heating cables set.
Shut off power supply to the floor heating system to prevent electrical
shock.
Important informations
- The Therma Cable floor heating system is designed exclusively for interior floor
heating. The system is not designed for snow melting or any other outdoor uses;
-Therma Cable is mainly designed to complement a building’s primary heating
source by serving as a secondary (floor warming) or primary room heat source
(radiant floor heating);
- Refer to Section 3 for instructions on heating a room using the Therma Cable
system only;
- Floor temperature varies based on insulation and floor characteristics;
- The Therma Cable system can be installed under a shower floor only if the
floor is ceramic or natural stone. A waterproof membrane must be used to
maintain the heating cables in a dry environment. Canada: A ground fault
circuit interrupter (GFCI) must be used with this heating device in bathrooms.
USA: A ground fault circuit interrupter (GFCI) must be used with this heating
device in bathrooms and in hydromassage bathtub locations;
- The Therma Cable system must be embedded in cement or an equivalent
binder (cement glue, ceramic glue or self-levelling cement);
- The system must be installed by a master electrician who is: able to evaluate
proper electrical resistance and wattage, familiar with installation-related risks
and knowledgeable about construction techniques as well as the installation
and use of the Therma Cable floor heating system;
- The system is only one step in the floor construction process. Each trade is
responsible for the quality of its work and must ensure that the work performed
by the previous tradesman has been duly completed according to code. All
tradesmen are engaged in the installation process and share joint responsibility
for it.
4
1. Therma Cable Floor Heating System
IMPORTANT!
IMPORTANT!
5
Components
aramid fiber roving
ground wire
(bare wire)
Two-phase conductor
120V: phase - neutral
240V/208V: phase - phase
heating cable
junction
cold lead
channel
strapping
cold lead
plywood
or concrete slab
strapping
heating cable
self-levelling
cement
cement glue
floor covering
aluminum
sheath
ground
wire
heating
wires
aramid fiber
roving
wire
insulation
PVC sheath
Fig. 1.1
Fig. 1.2
Technique for interlocking the plastic strappings
1.2 Always
- Read this guide in full before installing the product;
- Install the Therma Cable system with a regulating device;
- Use copper wires only;
- Perform the mandatory tests described in this guide and record readings on the
table of measures;
- Only use cement or an equivalent binder compatible with floor heating systems
(cement glue, ceramic glue, self-levelling cement);
- Ensure that the black heating cable is completely embedded in cement or an
equivalent binder (cement glue, ceramic glue, self-levelling cement);
- Ensure that the voltage supplied equals the nominal voltage of the Therma
Cable system;
- Repair the product only using the Therma Cable repair kit available at your
authorized Ouellet Canada Inc. dealer;
- Consult Ouellet Canada Inc.’s team of technical specialists for any questions
or for more information;
- Install Therma Cable at temperatures over 5 °C (40 °F).
- Heating cables must be at least 13 mm (1/2”) away from any combustible surface.
- Metal structures or materials used for the support of or on which cables or sets
are installed be grounded in accordance with the Canadian Electrical Code
(CSA C22.1 Section 10 and National Electrical Code).
- Installer of series heating cable sets must inspect and remove damaged or
defective heating cable sets before they are covered or concealed;
- Installer of series heating cable sets must mark the appropriate circuit breaker
reference (label) indicating which branch circuit supplies the circuit to those
electric heating cables.
1.3 Never
- Install Therma Cable sections so that the heating cables are less than 76 mm
(3”) from each other. The temperature could be too high and could cause
damages;
- Shorten or alter any part of the heating cable (fig. 1.3);
- Cross, overlap, or stack heating cables (they must not touch);
- Connect a 120V product to a 240V/208V power source;
- Use a bending radius under 20 mm (3/4”);
- Install a temperature regulator (thermostat or other) where it is accessible from
the shower or bath (install at least 1 m [3’ 4”] away);
- Staple heating cable or floor sensor end to the subfloor (fig. 1.3);
- Install the Therma Cable system if the safety seal is broken;
- Install the Therma Cable system under a closet or fixed items.
- Series heating cable sets shall not extend from beyond the room or area in
which they originate;
- Series heating cable sets are not to be installed in walls.
6
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Fig. 1.3
2.1 Surface Area and Power Output
of Therma Cable Products
208V = 75% of wattage at 240V.
7
2. Technical Information
Product #
120V
Length Surface 12 W/sq. ft. Surface 9 W/sq. ft. Power Resistance
ft. m sq. ft. sq. m sq. ft. sq. m Watts ohm
OTR0082 32 9.75 8 0.7 11 1.0 85 169.4
OTR0122 4012.19 100.9 131.2 120 120.0
OTR0152 52 15.85 13 1.2 17 1.6 150 96.0
OTR0172 6018.29 151.4 201.9 170 84.6
OTR0242 8024.38 201.9 272.5 240 59.9
OTR0302 100 30.48 252.3 333.1 300 47.5
OTR0362 120 36.58 30 2.8 40 3.7 360 39.6
OTR0422 140 42.67 35 3.3 47 4.3 420 33.7
OTR0472 160 48.77 40 3.7 53 5.0 475 29.8
OTR0602 200 60.96 50 4.6 67 6.2 600 23.3
OTR0722 240 73.15 60 5.6 80 7.4 720 19.0
OTR0842 280 85.34 70 6.5 93 8.7 840 16.2
OTR0962 320 97.54 80 7.4 107 9.9 960 14.2
Product #
240V/208V
Length Surface 12 W/sq. ft. Surface 9 W/sq. ft. Power Resistance
ft. m sq. ft. sq. m sq. ft. sq. m Watts ohm
OTR0170 60 18.29 15 1.4 20 1.9 170 338.8
OTR0240 80 24.38 20 1.9 27 2.5 240 240.0
OTR0300 100 30.48 25 2.3 33 3.1 300 192.0
OTR0360 120 36.58 30 2.8 40 3.7 360 159.8
OTR0420 140 42.67 35 3.3 47 4.3 420 137.0
OTR0475 160 48.77 40 3.7 53 5.0 475 121.1
OTR0600 200 60.96 50 4.6 67 6.2 600 95.0
OTR0720 240 73.15 60 5.6 80 7.4 720 79.2
OTR0840 280 85.34 70 6.5 93 8.7 840 67.4
OTR0960 320 97.54 80 7.4 107 9.9 960 59.0
OTR1080 360 109.73 90 8.4 120 11.2 1080 51.8
OTR1200 400 121.92 100 9.3 133 12.4 1200 46.6
OTR1440 480 146.30 120 11.1 160 14.9 1440 37.9
OTR1600 560 170.69 140 13.0 187 17.4 1600 34.1
OTR1920 640 195.07 160 14.9 213 19.8 1920 28.4
2.2 Insulation Test
Measure Therma Cable’s insulation resistance at each step using a meg-
ohmeter (fig. 2.2) and record readings on the measures’ table (this label is
available at the opening of the product).
For the warranty to be valid, fill out the measures’ table and ensure that the
10 readings have been correctly noted.
A qualified electrician must measure the system’s insulation resistance as follows:
- Use a calibrated megohmeter only;
- Measure insulation resistance at the free end of the cold lead, between the
phase conductor and ground;
- Write the reading in the measures’ table;
- This reading must be over 1,000,000 ohms;
- If the reading is under 1,000,000 ohms, stop work and contact Ouellet Canada
Inc.'s technical specialists at 1 800 463-7043.
8
CAUTION!
cold lead
Fig. 2.2
CAUTION! Dangerous Test
2.3 Resistance Test
Measure the resistance of the Therma Cable heating cable at each step
using a multimeter (fig. 2.3) and record readings on the measures’ table.
For the warranty to be valid, fill out the measures’ table and ensure that the
10 readings have been correctly noted.
A qualified electrician must measure the system’s resistance as follows:
- Use a calibrated multimeter only;
- Measure resistance at the free end of the cold lead, between the two phase
conductors;
- Write the reading in the measures’ table;
- Verify the heating cable integrity by comparing your reading to the value on
the cold lead label;
- If your reading is off or very different than the nominal resistance (see Table 2.1)
at any step, stop work and contact Ouellet Canada Inc.'s technical
specialists at 1 800 463-7043.
9
IMPORTANT!
cold lead
Fig. 2.3
The Therma Cable floor heating system can be used for two purposes maximi-
zing comfort.
Used as a secondary heat source (floor warming), it can help keep floor tempera-
ture comfortable year round. Used as a primary room heat source (radiant floor
heating), it provides uniform, comfortable, and enveloping warmth. For the latter
use, it is important to follow the specific recommendations outlined below.
In light of environmental factors beyond Ouellet Canada Inc.’s control—including
thermal insulation, heated area, floor covering emissivity, heat loss, and more—
we cannot guarantee that the Therma Cable system will provide a completely
uniform surface temperature in all cases, no matter how careful the installation.
Consequently, Ouellet Canada Inc. cannot be held liable for any discomfort (e.g.,
a cold area on the floor) caused by site-specific deficiencies. Ouellet Canada Inc.
liability is limited to the performance of its products.
3.1 Floor Warming
This type of heating is designed to enhance comfort and/or supplement the
room’s main heat source. It helps keep the floor at a pleasant temperature at all
times.
Installing this type of system is very easy: simply unroll the Therma Cable on the
floor, maintain it with the installation strappings, embed the heating cable in cement
or an equivalent binder (cement glue, ceramic glue, self-levelling cement) and install
the floor covering. Use the floor coverings listed in Section 3.3 and connect the
Therma Cable system to an appropriate thermostat, described in Section 5.
3.2 Radiant Floor Heating
Therma Cable can be used as the room’s primary heat source. It can heat the
room using the Therma Cable system only. Proceed as follows:
- Connect the system to an ambient temperature regulator;
- Calculate heat loss to ensure the system has enough power to heat the room;
- Sufficient insulation under the subfloor is very important. This insulation is to be
sure that the heat will rise into the room to be heated.
- Make sure to have a floor covering that meets the specifications listed in table 3.3.
10
3. Types of Heating and Floor Covering
Do not install a radiant floor heating system on a noninsulated or poorly
insulated subfloor, or over a crawl space.
The efficiency of this type of primary room heating system will depend on
factors such as available surface of the room to be covered with heating cable
(or sufficient percentage of the surface to be heated), heat conductivity of
the floor covering, insulation on outside walls, etc. We recommend that you
verify these points and seek professional advice before investing time and
money.
3.3 Typical Floor Coverings
The thermal resistance of the floor covering must not exceed R = 1.40
(RSI = 0.246). There is no such limit for the subfloor.
Table 3.3 Thermal resistance values for floor coverings
* The floor covering highlighted in grey is prohibited.
For engineered wood floorings, laminated hardwood flooring, vinyl cove-
rings, and linoleum glued to a concrete surface, consult your floor covering
manufacturer to ensure they are compatible with floor heating systems.
11
IMPORTANT!
IMPORTANT!
Typical floor covering Thermal resistance
R RSI
Vinyl tiles 0.20 0.035
Linoleum 0.22 0.039
Ceramic 0.25 0.044
Low-pile carpet 0.70 0.123
Parquet flooring 0.70 0.123
Floating floor 10 mm to 16 mm (3/8” to 5/8”) 0.70 0.123
Wood on lathes (strapping)* 2.10 0.368
IMPORTANT!
4.1 Planning Work
Materials provided by Ouellet Canada Inc.
-Therma Cable heating cable kit
- Installation strappings
- Installation instructions
- Service panel label
- Floor temperature sensor
Material required
- Temperature control with GFCI (available at Ouellet Canada Inc.)
- Cable check tester (available at Ouellet Canada Inc.)
- Stapler
- Protective glasses
- Measuring tape
- Broom
- Felt marker
- Tape
- Hot glue gun
- Wood chisel
- Hammer
- Multimeter and megohmeter
- Electrician tools
- Electrical tape
For installation over a concrete slab, add the following:
- Concrete chisel
- Drilling machine
- Percussion drill for concrete
Room Layout and Corresponding Therma Cable Product
- Create a room layout plan to scale (for maximum accuracy, use the Ouellet
Canada Inc. form designed for this purpose);
- Identify all stationary elements (toilet, bath, shower, counters, drawers, and
permanent furnishings) and never install the heating cable under these
stationary elements (fig. 4.1);
- Determine thermostat or temperature control location;
- Note room dimensions;
- Determine the electric cable (cold lead) location that will be connected to the
heating control;
- Calculate the heating area in square meters (sq.m.) [square feet (sq.ft.)];
- Select the Therma Cable product from Table 2.1 to cover 80% of the surface,
or subtract a mimimum of 50 mm (2 in) around walls and stationary elements.
12
4. Installation Instructions
cold lead
temperature
sensor
10'
8'
Fig. 4.1
We can help optimize your work plan.
Fax it to us at 1 800 662-7801. Clearly indicate all dimensions.
A minimum of one horizontal and one vertical dimensions are
necessary to validate the scale.
4.2 Preparing the Subfloor
- Clean and remove any debris, or protruding objects that could damage the
heating cable;
- Subfloor cracks must be filled with polyester wood filler (only for self-leveller);
- The subfloor must be solidly fastened in place to prevent movement;
- The application of a floor levelling product is recommended to prevent future
damage to the ceramic caused by subfloor movement;
- For concrete subfloors, apply a surface sealer that is compatible with electrical
heating systems in accordance with the cement glue manufacturer’s
instructions. Completely coat the surface;
- Let dry before installing the Therma Cable system (refer to the sealer's
instructions for drying time).
4.3 Marking the Floor
Felt marker
13
Fig. 4.3 a
- On the floor of an empty room (under construction or major renovations),
draw the location of stationary elements (toilet, bath, shower, counters,
drawers, permanent furnishings) that will be installed later. These marks will
outline the heating area to ensure the Therma Cable system is not placed
under these stationary elements.
- The floor temperature sensor must be centered between two parallel heating
cables. The ideal location is one where it is likely to be away from stationary
objects and sheltered from outside influences (sunlight) that could skew floor
temperature readings. For maximum comfort, the area above the sensor must
be free of obstruction.
4.4 Installing the Therma Cable Floor Heating System
14
Fig.4.3 b
Fig. 4.4 a
heating cable junction
channel
cold lead
Tape, hot glue gun, stapler
Remove the product from the box and verify the electrical and insu-
lation resistance of the heating cable.
Therma Cable strappings’ installation:
- The strappings are fixed on the floor with staples (T50) (when the floor is made
of plywood or wood) or with a hot glue gun.
- The strappings must follow the outline draw on the room layout (section 4.1)
- If the lacing distance between two strappings is over 0,625 m (2 ft), it is
necessary to place an intermediate strapping to maintain the cable in position
during the pouring of self-leveller, this strapping is installed at the end, after the
lacing of the cable.
- The cable can be installed under the ceramic tile of a shower or other wet
surfaces, the strappings and the heating cable must be glued under the
wateproofing membrane and not stapled, staples could damage the
waterproofing membrane.
Installation of Therma Cable
- Set the cable near the connection box and regularly lace the heating wire
respecting the distance between the sections; 76 mm (3”).
- Do not bend the cable at 90° when setting it in the strapping hooks; leave a
20 mm (3/4“) radius. This radius comes naturally; the cable must not be
forced to have a tight bend.
15
Fig. 4.4 b
on plywood
on concrete slab
- A tag is located at 50% of the cable length. During installation of the product,
verify the cable half tag to compare with your cable layout planification. Adjust
pattern with the result to cover the surface. If the cable is too long, use the
buffer zone to spend the remaining cable. Never shorten the heating cable.
The heating cable must not be shortened, neither cut.
- Avoid walking on the Therma Cable system. If you must, wear soft rubber soled shoes;
-Always start the Therma Cable at least 50 mm (2”) from the walls;
- It is important not to subject the heating cable to any mechanical strain
(stretching, bending radius under 20 mm [3/4”], scoring).
Never cut or score the heating cable.
Measure the cable’s electrical and insulation resistance and record
the readings on line 2) After installing the heating cable of the
measures’ table.
16
Fig. 4.4 c
IMPORTANT!
17
4.5 Installing the Temperature Sensor
Hot glue gun, hammer, wood chisel or concrete chisel
- To minimize floor height, chisel a 10 mm x 10 mm x 250 mm (3/8” x 3/8” x 10”)
channel in the subfloor to receive the floor sensor. The junction has an
insulation sheath and a slightly larger diameter than the heating cable.
The sensor must be embedded in cement or an equivalent binder (cement
glue, ceramic glue, self-levelling cement).
- Glue the sensor to the subfloor (fig. 4.5). The sensor must be solidly fastened
to the subfloor to ensure it stays in place when the cement or an equivalent
binder (cement glue, ceramic glue, self-levelling cement) is applied.
Fig. 4.5
IMPORTANT!
channel
temperature
sensor
4.6 Applying Self-Levelling Cement
Measure the cable’s electrical and insulation resistance and record the
readings on line 3) Before embedding the heating cable in self-levelling cement
of the measures’ table.
- Consult the manufacturer’s instruction for the type of floor covering (ceramic,
linoleum, or other). See Section 7, Expert Tips;
- Completely embed the heating cable in self-levelling cement (fig. 4.6). It is
crucial that the ENTIRE heating cable (BLACK) be embedded. No part of the
heating cable (BLACK) must be exposed. (A small part [top] of the heating
cable may be exposed at the surface of the self-levelling cement ONLY IF a
ceramic glue is used afterward AND embeds that part);
- Level the subfloor with self-levelling cement or cover the cable with a layer of
cement glue when installing the stones or ceramics.
Do not turn on the Therma Cable floor heating system before the cement
has completely dried. Follow manufacturer recommandations (may take up
to 30 days, depending on the product).
Once the cement or binder has dried, measure the cable’s electrical resis-
tance and record the readings on line 4) After embedding the heating cable
in cement of the measures’ table.
18
Fig. 4.6
IMPORTANT!
Final view
4.7 Connecting the System
The system must be connected by a master electrician.
Cold lead
- 240V/208V connection: - 120V connection:
Line 1 - Black Line - Black
Line 2 - Red Neutral - White
Bare wire - ground Bare wire - ground
Measure the cable’s electrical resistance and record the readings on line
5) Upon installing the thermostat of the measures’ table.
19
IMPORTANT!
Self-levelling
cement
cement glue
floor
covering
20
4.8 Measuring Resistance and Measures’ Table
- The master electrician who installed and connected the Therma Cable system
must complete the measures’ table (this label is available at the opening of the
product) and give it to the customer. This sheet must be kept near the
electrical service.
If this table is not duly completed, the warranty may be annulled. Warranty
terms are set out in Section 8.
4.9 Using the Therma Cable System
- The Therma Cable floor heating system is now ready for use. However, before
turning on the system, make sure the curing period specified by the cement or
binder manufacturer has expired. Adjust the thermostat's temperature based
on your needs and desired level of comfort.
CAUTION!
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